RT Journal Article SR Electronic T1 Sustaining quality improvement efforts: emerging principles and practice JF BMJ Quality & Safety JO BMJ Qual Saf FD BMJ Publishing Group Ltd SP 848 OP 852 DO 10.1136/bmjqs-2021-013016 VO 30 IS 11 A1 Robert E Burke A1 Perla J Marang-van de Mheen YR 2021 UL http://qualitysafety.bmj.com/content/30/11/848.abstract AB